sundstrand



3 Sheets-Sheet 1 z w a M Mkp L 0. J. SUNDSTRAND ADDING mqnma Filed Jan. 9. 1922 March 2 ,=1926.

March 2 .1925.

J. SUNDSTRAND ADDING lucaz'us filed-Jan. 9. 1922,

3 Sheets-Sheet z March 2 1926.

O. J. SUNDSTRAND ADDING momma Filed Jan. 9. 1922 3 lsy ts-sheet 5 I a 6 jzzdg/zfor 20 set up the multiplicand, and the repeat key Patented Mar. 2, 1-926. I

Q'UNITEDST'ATES PATENT. OFFICE.

OSCAR J. SUNDSTRAND, OF ROCKFORD, ILLINOIS, ASSIGNOR TO 'ROCKFORD MILLING- MACHINE COMPANY, OF ROCKFORD, ILLINOIS, A CORPORATION OF ILLINOIS.

' ADDING uncnmn.

Application tiled January 9, 1922. Serial No. 527,827.

To all whom it may concern:

' Be it known that I,OsoAR J. SUNDSTRAND, a citizen of the United States, residing at Rockford, in the county of \Vinnebago and State of Illinois, have invented certain new and useful Improvements in Adding Machines, of which the following is a specification.

The object of this invention is to provide means for facilitating the performance of repeat operations as used in multiplication and division.

The invention is herein shown as embodied in the well known Sundstrand adding machine. This machine is provided with a repeat key which obviates the neces sity of depressing the amount keys more than once when the same number is to be added a plurality of times. In performing multiplication the amount keys are used to is then depressed, after which the machine is operated as many times as there are units in the multiplier. The 0 key is then operated, after which the machine is operated a number of.times corresponding to the number of tens contained in the multiplier; and so on. In thus using the machine the operator is obliged to count the operations of the machine, and consequently is liable to obtain a wrong result through failure to perform the repeat operations the correct number of times.

The particular object of the present invention is to provide means for relieving thev operator of the necessity of counting the number of times the machine operates when repeatedly adding the same amount.

The invention is herein. shown as embodied in an electrically-operated adding 'machine. .The device that throws the motor into operation is placed under the control of a series of special keys numbered from 1 to 9. If the operator desires to repeat acertain number, say, eight times, he sets up said number by means of the amount keys, depresses the repeat key, and then depresses the special key numbered 8, whereupon the machine performs eight operations and stops. It will be seen that the operator is relieved of the necessity of keeping count of the number of operations of the machine.

In the accompanying drawings Figure 1 is a side elevation, with parts broken away, showing one embodiment of the present invention. Fig. 2- is an underside view of certain parts comprised in the machine. Fig. 3 is a fragmental side elevation upon a larger scale than that used in Fig. 1. Fig. 4 isa sectional view taken in the plane of dotted line 4 of Fig. 6. Figs. 5 and 6 are views takenin the plane of dotted lines 5 and 6 of Fig. 4, but showing the slide 579 in a different position. Fig. 7 is a side elevation of certain mechanism com rised in the machine. Fig. 8 is a detail view of a lock for the special keys. Fig. 9 is a detail plan view of the slide 579. Fig. 10 is a plan view of the key-board.

In the drawings, M is a motor connected in any ordinary or suitable manner to operate the adding machine, the driving connections comprising a clutch C. The operation of the clutch is controlled b means of a lever 550 pivoted at 551 and normally held in position to throw the clutch out by means of a spring 552 (Fig.

7). A plunger 553 is guided in the framework of the machinefor vertical movement. On said plunger is mounted a vertically movable slide 553 which is normally held 111. its lower position by a coiled contractile spring 553*. The slide 553 carries "a pin 554. that overlies the forward end of the lever 550. It will be seen that depression of the plunger 553 and the slide 553 against the tension of the spring 552 will cause the clutch to be thrown in. Means to be presently described is provided for depressing the plunger 553 and holding it depressed for a time corresponding to the length of the repeat operation. It is customary to drive the clutch C at a higher speed than that at which the adding machine is designed to operate. It is therefore necessary to provide means whereby the clutch C is thrown in and out at the proper times during each cycle of operations of the adding machine. Such clutch-controlling means having become well known through commercial use of the motor-driven Sundstrand adding machine, I have deemed it unnecessary to describe the same herein.

On the plunger 553 is a lug 555 which is arranged to be depressed by a universal plate 556 (Figs. 4, 5 and 6) which is pivoted at 557 and 558 (Figs. 5 and 6) in the framework. A coiled contractile spring 559 (Figs. 3 and 6) tends to raise the plate 556 into the position shown in Fig. 6.

The means for de ressing the universal plate 556 and thus tlirowing in the clutch comprises a set of keys 561. to 569, inelusive. These keys are located at the right-hand side of the keyboard, as shown in Fig. 10. In order that the stems of the nine keys 561to 569, inclusive, may be arranged in a single row in the limited space avallable at the side of the keyboard, the upper ends of the stems of alternate keys I arebent in op osi'te directions so as to d1s Y 570 has a pin 577 pose the keys in two parallel rows, as best shown in Fig. 6. Y The keys 561 to 569 bear the numerals 1. to 9 respectivel the key 561 being at the forward endof t ;e set of keys. The. stemsof said keys are indicated at 570 in the drawings. The up er portions of the stems- 570 extend slidably through slots in a plate 571. For each stem 570 there' is PIOVldGd. a coiled contractile spring 572 (Fig. 3) which tends to lift the key stem. Upward movement of the key stem is limited by contact of a. lug 573 on the stem with the lower side of the plate 571. The lower portion of each stem 570 extends slidably-through a slot 574- (Fig. 8) in a plate 575. As shown in Fig; 4, the plate 556-has an opening 576 throu which the key stems 570 extend. Each ey stem (Figs. 4 and 5) that overlies the plate 556. I a

Means is provided to lock each stem 570 (except the one for the 1 key) upon depression of its key. Said means comprises a shoulder 578 formed by making a recess in the lower portion of the stem 570 and in such position that when. the stem is depressed the shoulder 578 is laced below the plane of the plate 575. T e spring 572 is so arranged as to exert a tendency to swing the stem. 570 forwardly to place the shoulder 578-beneath the late 575 at the forward end of the slot 5 4, as shown in Fig. 8. It will be seen that when any one of the keys 561 to 569 is depressed so as .to carry the shoulder 57 8 below the plane of the plate 575, the spring 572 will move the stem 570 of that key forwardly to carry said shoulder beneath the plate at one end of the slot 574 and thus prevent the stem from rising, thus incidentally holding the plate 556 and the lunger 553 down.-

Means is provi ed for disengaging the shoulder 578 from the locking plate'5-7 5.

This means becomes effective upon the .com-

pletion of two cyclesof operations of the addin machine in the case of depression of the ey 562, numbered 2 upon the completion of three cycles in thecase of the ey numbered 3 and so on. The unlocking means referredto comprises a slide 57 9 (Figs. 3 and 9) slidablv mounted on the plate 556 by means of two headed studs 580 i on said slide extending through a slot 581 (Fig. 4) in the plate 556. On the slide 579 movement of the lug 582. The lugs 583 are uniformly spaced apart. Normally the slide 579 is at the forward, end of the plate 556, being held thereby a coiled contractile spr1ng584 anchored at one end to the plate 556, and connected at its other end to one of the studs 580. The means for moving the-slide 579 rearwardly .to engage a lug 583 on a depressed stem 570 comprises a ratchet bar-585 which is guided for longitudinal r ciprocation and is also mounted so as to e free to yield downwardly. A leaf spring 586 normally holds the ratchet bar 585 up. The rear end of the ratchet bar 585- is connected through a link 587 (Fig. 3) with a'bell crank lever 588 which is pivoted on the axis of the main rock shaft 26 of the machine. A coiled contractile spring 589 normally holds one arm of the bell crank lever 588 against a pin 590 on an arm 591 that swings with the shaft 26. When the shaft 26 makes its forward swing the ratchet bar 585 is drawn rearwardly. The depression of one ofthe keys 561 to 569 lowers the plate 556 "so that suitable projecting means as the tooth 592 of the adding machine. The means forholding the slide 57 9 against forward movement due to its spring 584 during the for-.

ward strokes of the ratchet bar 585 com-. prises a ratchet bar 593 generally similar to the ratchet bar 585 and arranged for downwardly yielding movement. 1 A leaf spring 594 (Fig; 5) normally holds the ratchet bar 593 up. The teeth of the patchet bar 593 are arranged to engage the 00th 592 on the slide 57 9 and thus hold said slide against return movement while the ratchet bar 585 is being given forward strokes. f

Means is provided to prevent the keys 562 to 569 from being locked in depressed position. The means herein shown for this purpose comprises a bar 595 .(Figs. 2, 5 and 6) mounted for limited longitudinal movement beneath the plate 575. In the plate 595 are notches 596. A coiled contractile springs 597 normally holds the plate 595 in such' position that the notches 596 register with a such forward movement, the spring 597 beingweaker that the spring 572. 598 is alever pivoted .at 599 'on the lower side of the plate 575. One end. of said lever ispeat a certain'number, say, seven times, he

sets" up the desired number by depressing the amount keys (not shown), then depresses the repeat key- (not shown), and

' then depresses the key 567 bearing the numeral 7. When the" key' 567 is depressed the pin 577 on the stem 570 of said key depressesthe hinged plate556 and the latter depresses the lug 555, thereby depressing the plunger 553 and the slide 553 and causing the lever 550 to be moved in the direction to throw in the clutch C. In the depression of the key stem 57 0 the shoulder 578 thereon was carried below the plane of the plate 575, whereupon the spring 572 drew the key stem forward until said shoul- -,der lay beneath the plate 575, thereby locking the lever 550 in pos ition to permit continued operation of the clutch.) The depression of the plate 556 brought the tooth 592 into position for engagement bythe teeth of the ratchet bars 585 and 593. In every forward swing of the main shaft 26 of the machine the ratchet bar 585is drawn rearwardly, carrying theslide 579 with it,

i said slide being thus moved step by, step,--

one step for each cycle of operations of the machine." During the seventh forward swing of the main, sha'ft26 the lug 582 on the slide 579 engages the lug 583 on the key stem of the'key 567 and swings said key stemv rearwardly until the shoulder 578 is clearof the plate 575, whereupon the spring 572- raisesthe key'stem to its normal position,

thereby enabling the spring 559 to lift the plate 556 to normal position, permitting the spring 584 to restore the slide 579 to its normal forward position, and allowing the spring 552- to lift the-plunger 553 and slide 553 and place the lever 550 in positlonto 'throw out the clutch- (-3 on-the completion of the seventh cycleof operations. The machine thus stops after thedesired number has been added seven times.

I claim'as my invention:

1. An adding machine having, in com-' bination, a row of key stems, means to lock any of said stems in depressed position, a projection upon each key stem, a slide arranged to bemovedv along said row of stems from one stem to the next stem in each cycle of operations of the machine and to engage the projection of a depressed key stem, a spring tending to hold said slide in initial .cycle of operations of the adding machine,

and means for disengaging the tooth and said bars after said slide has engaged the projection of a depressed key stem.

2. An adding machine having, in combination, a row of key stems, means to lock any o'f said stems in depressed position, a projectlon upon each key stem, a slide arranged to be moved along said row of stems from one stem to the next stem in each cycle of operations of the machine and to engage the projection of a depressed key stem, a 7

spring tending to hold said slide in initial position at one end of the row, a tooth on said slide, a ratchet bar extending along the path of the slide and arranged to be engagedcby said tooth, means for reciprocating said ratchet bar to advance the slide step by step along the row of key stems during the operation of the adding machine, means to hold the slide during the intervals between steps, and means for disengaging the tooth and said bar after. said slide has engaged the projection of a depressed key stem.

3. The combination 'of an adding machine, a driver for the adding machine, a series of keys having stems arranged ina row, means to lock the key stems in deressed position, a projection on each of said ey stems, a movably mounted part underlying all of said projections, a driver-controlling member arranged to be moved by said part, a slide carried by the movably mounted part and movable longitudinally of the series of key stems, a spring tending to hold the slide at one end of the series, means actuated by the addin machine for moving the slide toward 1: e other end of the series, and a projection on each key stem arranged to be engaged by said slide when .the'stem is in depressed position to release all of said projections, a driver-controlling member arranged to be moved by said part, a slide supported on said part and movable longitudinally of the series of key stems, the motions-of said art and said slide being in relatively i-iferent directions, a

spring tending to hold the slide at one end series of keys having stems arranged in a row, means to lock the key stems in depressed position,'a driver-controlling member arranged to be moved by any one of said key stems, a slide mounted on said member and-movable longitudinally of the series of key stems, a spring tending to hold the slide at one end of the series, and' means actuated by the adding machine for moving the slide toward the other end of the series, said slide being arranged to release a depressed key stem from said locking means, the position of said member effecting operation of the machine being such as to place said slide in an engaging relation with said means.

6. The combination of a series of keys havin stems arranged in a row, means to lock the key stems in depressed position,]a movably mounted part arranged to be moved by any of said key stems, a slide mounted on said part and movable longi-.

tudinally of the series of key stems, a spring tending to hold the slide at one end of the series, cooperating moving and holding means including a ratchet bar for moving the slide step by step toward the other end of the series, and a projection on each key stem arranged to be engaged by said slide when the stem is in de ressed position to release the key stem means, the mounting of. said slide on said movable part serving to disengage the slide from said ratchet bar when the key stem is released.

7. The comblnatlon of a series ofv keys havin stems arranged ma row, means to lock the key stems 1n depressed position, a

universal member arranged .to be moved by any of said key'stems, a slide mounted on said member and movable longitudinally of the series of key stems, a spring tending to hold the slide at one end'of the series, and means for moving the slide step by step toward the other end of the series, said slide being arranged to release. a depressed key stem from said locking means, whereby to release the slide for movement thereof-- bysaid spring' 8. A motor-driven adding machine having, in combination, a series of motor controlling keys, -means to lock each key automatically upon depression whereby the machine is operated a succession of times by the motor, a traveling member movable in rom said. docking a line with the keys step by step by the operation of the machine, actuating means to move said member step by step from one end of the series-toward the depressed key, cooperating means on the key and the member to release the key from locked position, means including a part carried by the key to withdraw the member from the actuating means, and means to return the member to the first end of the series. 9. A motor-driven adding machine having, in combination, a series of keys, automatic locking means therefor, universal means moved by depression of any key to start the machine in operation, a slide movable step by step by the operation ofthe machine along the keys to the-depressed ke means to move said slide, means on the sli e to release the locked key and the universal means whereby the machine is sto ped, and means to return the slide to its initial position, the slide on return being moved after release of the key in a different path from its step by step movement.

10. The combination of an adding machine, a motor-driven clutch, a pivoted lever controlling said clutch, a plunger, a slide on the plunger, a spring tending to hold said slide in normal position on said plunger, a projection on said slide to engage the lever, a projection on the plunger, a universal member to engage the last-mentioned projection, digital means to move said memher in one direction, and automatic means to move said member in-the opposite direction.

11. A motor-driven adding machine having a plurality of alined motor controlling keys, means. to lock any key depressed to operate the machine a succession of times, a traveling member mounted therein for motion in' a cyclic-path comprising motion in four directions, that in the first direction bei simultaneous with the depression of the ey whereby the member ispositioned for the next motion, means engaging therewith to move the member by operation 0 the machine, the motion in the "second direction being toward the depressed key and being simultaneous with the operation of the machine and in pro ortion thereto, cooperating means on t e key and member to release the key to stop the machine, the motion in the thirddirection being simultaneous with the release of the keywhereby -the member-is withdrawn from the engaging means, and a spring to move said memher to its initial position, said movement being the motion in the fourth direction.

In testimony whereof, I have hereunto afiixed my signature. 7

f no 

